The o-series of models are trained with reinforcement learning to think before they answer and perform complex reasoning. The o3-pro model uses more compute to think harder and provide consistently better answers.
Note that BYOK is required for this model. Set up here: https://openrouter.ai/settings/integrations(opens in new tab)
Modalities
Context
200K
Released
Jun 10, 2025
Knowledge Cutoff
Jun 2024
Token volume and request traffic to this model over time.
The o-series of models are trained with reinforcement learning to think before they answer and perform complex reasoning. The o3-pro model uses more compute to think harder and provide consistently better answers. Note that BYOK is required for this model. Set up here: https://openrouter.ai/settings/integrations(opens in new tab)
o3 Pro has a 200,000 token context window.
o3 Pro accepts text, files such as PDFs and images as input and returns text.
GPT-6 Astra, GPT-6 Astra Pro, GPT-5.6 Luna Pro and 56 more are other text models from OpenAI.
o3 Pro was released on June 10, 2025. Its knowledge cutoff is June 30, 2024.